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Identify which specific statistical metric the student should use for this dataset, and explain what specific aspects of the relationship this metric will help the student evaluate.
Case context: A psychology undergraduate is analyzing data from a recent study. The dataset contains two continuous factors: the amount of daily screen time in minutes and the score on an attention span assessment. The student's goal is to describe and quantify the correlation between these variables using a standardized measure.
Question: Identify which specific statistical metric the student should use for this dataset, and explain what specific aspects of the relationship this metric will help the student evaluate.
Sample answer: The student should use Pearson's . This metric will help the student evaluate the linear relationship between the two continuous factors by providing a standardized measure of both the strength and the direction of the correlation.
Key points:
- The correct statistical metric to use is Pearson's .
- It evaluates the linear relationship between the continuous factors.
- It measures the strength of the correlation.
- It measures the direction of the correlation.
Rubric: A correct response must diagnose the need for Pearson's and demonstrate comprehension by explaining that it quantifies the strength and direction of the linear relationship between the two continuous variables in the scenario.
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Research Methods in Psychology - 4th American Edition @ KPU
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Pearson's r Formula
Restriction of Range
Cohen's Guidelines for Interpreting Pearson's r
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